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CentOS 7.0 - man page for ares_library_cleanup (centos section 3)

ARES_LIBRARY_CLEANUP(3) 	     Library Functions Manual		  ARES_LIBRARY_CLEANUP(3)

       ares_library_cleanup - c-ares library deinitialization

       #include <ares.h>

       void ares_library_cleanup(void)

       cc file.c -lcares

       The  ares_library_cleanup function uninitializes the c-ares library, freeing all resources
       previously acquired by ares_library_init(3) when the  library  was  initialized,  provided
       there  was  only  one single previous call to ares_library_init(3). If there was more than
       one previous call to ares_library_init(3), this function uninitializes the c-ares  library
       only  if  it  is  the call matching the call to ares_library_init(3) which initialized the
       library	(usually  the  very  first  call  to  ares_library_init(3)).   Other   calls   to
       ares_library_cleanup(3) have no effect other than decrementing an internal counter.

       This  function must be called when the program using c-ares will no longer need any c-ares
       function. Once the program has called ares_library_cleanup(3) sufficiently often such that
       the library is uninitialised, it shall not make any further call to any c-ares function.

       This function does not cancel any pending c-ares lookups or requests previously done. Pro-
       gram  must use ares_cancel(3) for this purpose.

       This function is not thread safe.  You have to call it once the program is about to termi-
       nate,  but this call must be done once the program has terminated every single thread that
       it could have initiated. This is required to avoid potential race  conditions  in  library
       deinitialization,  and  also due to the fact that ares_library_cleanup(3) might call func-
       tions from other libraries that are thread unsafe,  and	could  conflict  with  any  other
       thread that is already using these other libraries.

       Win32/64  application  DLLs  shall not call ares_library_cleanup(3) from the DllMain func-
       tion. Doing so will produce deadlocks and other problems.

       This function was first introduced in c-ares version 1.7.0 along with  the  definition  of
       preprocessor  symbol  CARES_HAVE_ARES_LIBRARY_CLEANUP as an indication of the availability
       of this function. Reference counting in	ares_library_init()  and  ares_library_cleanup(),
       which requires calls to the former function to match calls to the latter, is present since
       c-ares version 1.10.0.  Earlier versions would deinitialize the library on the first  call
       to ares_library_cleanup().

       Since  the  introduction  of  this function, it is absolutely mandatory to call it for any
       Win32/64 program using c-ares.

       Non-Win32/64   systems	can   still   use   c-ares   version   1.7.0   without	  calling
       ares_library_cleanup(3)	due to the fact that currently it is nearly a do-nothing function
       on non-Win32/64 platforms.

       ares_library_init(3), ares_cancel(3)

       Yang Tse

       Copyright 1998 by the Massachusetts Institute of Technology.
       Copyright (C) 2004-2009 by Daniel Stenberg.

					   19 May 2009			  ARES_LIBRARY_CLEANUP(3)

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